拜读了《小学教学设计》2005年第2期《“2/1+1/3=52”和“2/1+3/1=5/6”具有同等价值》一文后,笔者认为程来平老师的看法欠妥。程老师认为“2/1+1/3=5/2”是一种模式,只要相加两数的分数单位是“等量”或“同量”就行。其中一个充分的论据是:“某人投篮,第一次投2进1,进2/1;第 After reading Primary School Teaching Design, No. 2, 2005, “2/1 + 1/3 = 52” and “2/1 + 3/1 = 5/6” have the same value, Misconceptions. Cheng thinks “2/1 + 1/3 = 5/2” is a pattern, as long as the unit of the sum of the two numbers is “equal” or “same amount”. One of the full arguments is: "Somebody shot, first cast 2 into 1, into 2/1;